mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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271 lines
6.9 KiB
Go
271 lines
6.9 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package cmdtest
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"regexp"
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"sync"
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"testing"
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"text/template"
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"time"
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"github.com/docker/docker/pkg/reexec"
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)
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func NewTestCmd(t *testing.T, data interface{}) *TestCmd {
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return &TestCmd{T: t, Data: data}
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}
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type TestCmd struct {
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// For total convenience, all testing methods are available.
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*testing.T
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Func template.FuncMap
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Data interface{}
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Cleanup func()
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cmd *exec.Cmd
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stdout *bufio.Reader
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stdin io.WriteCloser
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stderr *testlogger
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}
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// Run exec's the current binary using name as argv[0] which will trigger the
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// reexec init function for that name (e.g. "geth-test" in cmd/geth/run_test.go)
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func (tt *TestCmd) Run(name string, args ...string) {
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tt.stderr = &testlogger{t: tt.T}
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tt.cmd = &exec.Cmd{
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Path: reexec.Self(),
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Args: append([]string{name}, args...),
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Stderr: tt.stderr,
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}
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stdout, err := tt.cmd.StdoutPipe()
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if err != nil {
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tt.Fatal(err)
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}
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tt.stdout = bufio.NewReader(stdout)
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if tt.stdin, err = tt.cmd.StdinPipe(); err != nil {
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tt.Fatal(err)
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}
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if err := tt.cmd.Start(); err != nil {
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tt.Fatal(err)
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}
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}
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// InputLine writes the given text to the childs stdin.
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// This method can also be called from an expect template, e.g.:
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//
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// geth.expect(`Passphrase: {{.InputLine "password"}}`)
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func (tt *TestCmd) InputLine(s string) string {
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io.WriteString(tt.stdin, s+"\n")
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return ""
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}
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func (tt *TestCmd) SetTemplateFunc(name string, fn interface{}) {
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if tt.Func == nil {
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tt.Func = make(map[string]interface{})
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}
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tt.Func[name] = fn
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}
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// Expect runs its argument as a template, then expects the
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// child process to output the result of the template within 5s.
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//
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// If the template starts with a newline, the newline is removed
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// before matching.
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func (tt *TestCmd) Expect(tplsource string) {
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// Generate the expected output by running the template.
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tpl := template.Must(template.New("").Funcs(tt.Func).Parse(tplsource))
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wantbuf := new(bytes.Buffer)
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if err := tpl.Execute(wantbuf, tt.Data); err != nil {
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panic(err)
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}
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// Trim exactly one newline at the beginning. This makes tests look
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// much nicer because all expect strings are at column 0.
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want := bytes.TrimPrefix(wantbuf.Bytes(), []byte("\n"))
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if err := tt.matchExactOutput(want); err != nil {
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tt.Fatal(err)
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}
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tt.Logf("Matched stdout text:\n%s", want)
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}
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func (tt *TestCmd) matchExactOutput(want []byte) error {
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buf := make([]byte, len(want))
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n := 0
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tt.withKillTimeout(func() { n, _ = io.ReadFull(tt.stdout, buf) })
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buf = buf[:n]
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if n < len(want) || !bytes.Equal(buf, want) {
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// Grab any additional buffered output in case of mismatch
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// because it might help with debugging.
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buf = append(buf, make([]byte, tt.stdout.Buffered())...)
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tt.stdout.Read(buf[n:])
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// Find the mismatch position.
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for i := 0; i < n; i++ {
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if want[i] != buf[i] {
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return fmt.Errorf("Output mismatch at ◊:\n---------------- (stdout text)\n%s◊%s\n---------------- (expected text)\n%s",
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buf[:i], buf[i:n], want)
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}
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}
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if n < len(want) {
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return fmt.Errorf("Not enough output, got until ◊:\n---------------- (stdout text)\n%s\n---------------- (expected text)\n%s◊%s",
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buf, want[:n], want[n:])
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}
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}
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return nil
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}
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// ExpectRegexp expects the child process to output text matching the
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// given regular expression within 5s.
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//
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// Note that an arbitrary amount of output may be consumed by the
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// regular expression. This usually means that expect cannot be used
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// after ExpectRegexp.
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func (tt *TestCmd) ExpectRegexp(resource string) (*regexp.Regexp, []string) {
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var (
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re = regexp.MustCompile(resource)
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rtee = &runeTee{in: tt.stdout}
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matches []int
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)
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tt.withKillTimeout(func() { matches = re.FindReaderSubmatchIndex(rtee) })
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output := rtee.buf.Bytes()
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if matches == nil {
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tt.Fatalf("Output did not match:\n---------------- (stdout text)\n%s\n---------------- (regular expression)\n%s",
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output, resource)
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return re, nil
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}
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tt.Logf("Matched stdout text:\n%s", output)
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var submatches []string
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for i := 0; i < len(matches); i += 2 {
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submatch := string(output[matches[i]:matches[i+1]])
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submatches = append(submatches, submatch)
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}
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return re, submatches
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}
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// ExpectExit expects the child process to exit within 5s without
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// printing any additional text on stdout.
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func (tt *TestCmd) ExpectExit() {
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var output []byte
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tt.withKillTimeout(func() {
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output, _ = ioutil.ReadAll(tt.stdout)
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})
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tt.WaitExit()
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if tt.Cleanup != nil {
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tt.Cleanup()
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}
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if len(output) > 0 {
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tt.Errorf("Unmatched stdout text:\n%s", output)
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}
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}
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func (tt *TestCmd) WaitExit() {
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tt.cmd.Wait()
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}
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func (tt *TestCmd) Interrupt() {
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tt.cmd.Process.Signal(os.Interrupt)
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}
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// StderrText returns any stderr output written so far.
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// The returned text holds all log lines after ExpectExit has
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// returned.
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func (tt *TestCmd) StderrText() string {
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tt.stderr.mu.Lock()
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defer tt.stderr.mu.Unlock()
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return tt.stderr.buf.String()
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}
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func (tt *TestCmd) CloseStdin() {
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tt.stdin.Close()
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}
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func (tt *TestCmd) Kill() {
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tt.cmd.Process.Kill()
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if tt.Cleanup != nil {
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tt.Cleanup()
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}
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}
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func (tt *TestCmd) withKillTimeout(fn func()) {
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timeout := time.AfterFunc(5*time.Second, func() {
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tt.Log("killing the child process (timeout)")
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tt.Kill()
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})
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defer timeout.Stop()
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fn()
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}
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// testlogger logs all written lines via t.Log and also
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// collects them for later inspection.
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type testlogger struct {
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t *testing.T
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mu sync.Mutex
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buf bytes.Buffer
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}
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func (tl *testlogger) Write(b []byte) (n int, err error) {
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lines := bytes.Split(b, []byte("\n"))
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for _, line := range lines {
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if len(line) > 0 {
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tl.t.Logf("(stderr) %s", line)
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}
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}
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tl.mu.Lock()
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tl.buf.Write(b)
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tl.mu.Unlock()
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return len(b), err
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}
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// runeTee collects text read through it into buf.
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type runeTee struct {
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in interface {
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io.Reader
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io.ByteReader
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io.RuneReader
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}
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buf bytes.Buffer
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}
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func (rtee *runeTee) Read(b []byte) (n int, err error) {
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n, err = rtee.in.Read(b)
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rtee.buf.Write(b[:n])
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return n, err
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}
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func (rtee *runeTee) ReadRune() (r rune, size int, err error) {
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r, size, err = rtee.in.ReadRune()
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if err == nil {
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rtee.buf.WriteRune(r)
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}
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return r, size, err
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}
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func (rtee *runeTee) ReadByte() (b byte, err error) {
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b, err = rtee.in.ReadByte()
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if err == nil {
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rtee.buf.WriteByte(b)
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}
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return b, err
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}
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